Hand-drill attachment



Sept. 3, 1929- R. J. F. HICKS HAND DRILL ATTACHMENT Filed 001;. 8, 1927 2 Sheets-Sheet 1 IIIIIIIIIIIIHHIIIII lllllllll wax/r7 /7 6762415.

I N VEN TOR.

w MW A TTORNEYS.

Sept. 3, 1929.

R. J. F. HICKS HAND DRILL ATTACHMENT 2 Sheets-Sheet 2 Filed Oct. 8, 1927 Ill-llllll IlllIl/II/z /705/?7 4/: W/C/fJZ I INVENTOIg.

ATTORNEYS.

Patented Sept. 3, 1929.

UNITED STATES ROBERT J; r. HICKS, or ROCKAWAY BEACH, NEW YORK.-

. HAND-DRILL ATTACHMENT.

Application filed October 8, 1'927. Serial No. 224,979..

This invention-appertains to tools and more particularly to a novel attachment for an ordinary hand or breast drill, but which is susceptible for use with other types of drills.

One of the primaryobj'ects of the invention is to provide an attachment for an ordinary hand or breast drill for guiding the drill when drilling holes in the end of round, or polygonal metal or wood stock and for'centeiring work before turning on a lathe or the li .ze.

Another salient object of the invention is the provisiono-f an attachment for a brace or the like embodying a sleevelhaving rockably connected therewith centeringarms for gripping the work whereby the bit or other tool will be disposed in exact axial alinement with the work. 1 V

A further object of the invention is-the'provision of novel means for forming the centering arms and novel means for moving the arms toward and away from the-work.

A further object of the invention is the provision of novel gripping jaws pivotally connected with the arms for direct engagement with the work, the jaws being so formed as to interfit one with the other, so as to permit of the effective engagement thereof with work of relatively small diameter. I A further object of the invention isthe protachment whereby screw threads can be readily made on a pieceof work, novel means being provided whereby the number of threads to an inch can be adjusted. l

A further object of the invention is the'provision of a novel tool-holder for connection with the attachment for supporting a single cutting tool having a diamond point, therentire device rendering the cutting of the 1 threads a quick and easyoperation. j V

A still further object of the invention is to provide an attachment for hand and breast drills ofthe above character, which will be durable and efficient in use, one that willvbe simple and easy; to manufacture and, onewhich can be placed upon the market and incorporated with a brace at a small cost.

With these and other objects in view, the invention. consists in the novel construction, arrangement and formation of parts, as will be hereinafter more specifically described, claimed, and illustrated in the accompanying drawings, in which drawings:

Figure 1 is a side elevation'of the improved attachment showing the same being usedfor cutting threads on a sectionof pipe. I

Figure 2 is a section taken on the line 2-2 of Figure 1 looking in the direction of the arrows, illustrating. the attachment in end elevation;

1 Figure3 is a detailv perspective view of the adjustableho-lder of the thread cutting tool; Figure 4 is a section through the attachment taken on the line l4 of Figure 1 looking in the direction of the arrows, and

Figure 5 is a side elevation partly in section of the, improved attachment illustrating the use thereof on polygonal work and for boring a recess in the axial center thereof.

Referring to the drawings in detail, where in similar reference characters designate corresponding parts throughout the several.

views, the letter A generally indicates the improved attachment fora hand or breast brace.

connected to the chuck of a brace (not shown) in any desired way. The forward end of'th'e shank 10 is in turn providedwith any desired type of chuck 11 which is provided for receiving a drill bit or other tool aswill belater described.

In accordance with this invention, a sleeve i i f means f cqnnection ith th t- "12 is slidably mounted upon the shank 10 and is provided at spaced points such as at quar- .ters, with pairs of ears 13'. Each pair of ears of the arms 15 have rockably connected thereto by means ofpivot pins or the like 16, clamping jaws 17. The opposite faces of these 'aws 17 are serrated or provided with gripping teeth 18. The formation of the jaws 17 ,forms an important feature of the invention and it is to be noted that the side edges of the jaws are beveled as at 19, so that these jaws 1 will interfit with one another, whenthe arms 15 are brought to their innermost adjusted position. This'allows the gripping of work of a relatively small diameter. I prefer to provide two different means for adjusting the arms 15 toward the work, but either one may beeliminated if found desirable. One

of the adjusting means comprises an annular ad ustlngring 20', the mner face of WhlCh 1s slightly tapered toward the jaws 17 and provided with screw threads 21. The outer face of the adjusting ring 20 can be milled or otherwise treated to permit an effective grip to be had thereon. The outer faces of the arms adjacent to the forward ends thereof are provided with partial threads 22, which are adapted to be engaged by the threads 21 of the ring 20. It is obvious that byturning the ring toward the transverse center of the arms 15, that these arms will be moved toward one another, but that by loosening the ring 20 or unthreading the same toward the jaws 17, that the arms will be permitted to move outwardly.

If preferred, expansion springs 23 can be interposed between the arms 15 and the sleeve 12 for normally urging the arms radially of the chuck 11.

A second adjusting means comprises a substantiall y cone shaped nut 24, which is threaded upon the outer end of the sleeve 12 and the rear ends of the arms 15 are provided. with angularly extending ears against which the tapered face of the cone nut 24 engages. It is obvious that by operating the nut 24, that the same will be moved into engagement with the ears 25 and thus adjust the arms 15 toward one another.

Referring more particularly to Figure 1, in which I have shown the attachment in use for cutting threads on a length of pipe, it is to be noted that a spiral spring is placed upon the shank 10 inward of the chuck 11 and that one end of the spiral spring is anchored to the shank as at 31. The anchoring means in the present instance can be in the nature of a screw as indicated in the drawings. The inner or rear end of the spiral spring 30 has connected thereto a calibrated rod 32 and this rod is in turn anchored to an adjusting nut 33, which is threadedon a threaded portion 34 of the shank 10. An indicatin means is formed on the shank to cooperate with the calibrations on the rod 32 and this indicating means, in the present instance, consists of an annular groove 35 formed in the shank.

By tightening up on the nut 33, the spring 30 can be contracted or expanded and this spring is utilized for controlling the number of threads cut on the work, as will be later brought out. It is to be noted, however, that the sleeve 12 carries at its forward end an ear 36 and that this ear is provided with an adjustable thumb screw 37 which can be moved into and out of engagement with the spiral spring 30.

lVhen the attachment is to be used for cutting threads on a piece of work, a novel tool holder 40 is utilized. This holder 40 is clearly shown in Figure 2 of the drawings and includes a post or shank 41 which is adapted to be clamped within the chuck 11. The forward end of the post 41 has formed thereon or secured thereto a socket sleeve 42 for receiving a graduated arm 43 which can be held in an adjusted position in the socket sleeve 42 by means of a thumb screw 44. The outer end of the graduated post 43 in turn carries a socket sleeve 45 in which is slidably mounted a tool arm 46 and this tool arm can be held in an adjusted position in the sleeve 45 by means of a thumb screw 47. The tool post 46 carries sockets 43 for receiving tae cutting tool 49, which is held in adjusted position therein by means of a thumb screw 50. It is to be noted that the tool 49 is provided with a single cutting point which is preferably diamondpointed,

By the use of the novel tool holder, the cutting tool 49 can be accurately adjusted relative to the work and the depth of the threads to be out can be controlled by the adjustment of the arm 33 relative to the post or shank 41.

In use of the improved attachment, the work, such as a sect-ion of pipe as indicated by the reference character P, is placed in position between the jaws 17 and the arms 15 are adjusted by means of the ring 20 or nut 24 for clamping the work tightly in place and centered relative to the main shank 10. The nut 33 is now turned by expanding orcontracting the spring 30 in accordance with. the number of threads per inch which are to be cut on the work and the post 41 or shank is inserted. in the chuck 11. The tool 49 and the calibrated shank 43 is adjusted according to the depth to which the threads are to be cut and the brace (not shown) is operated in the ordinary manner. This will effectively cutthe threads on the pipe.

This method has been found to be much more effective than the ordinary guides now in use and the single toothed cutting tool will effectively cut the threads in the work in a minimum amount of time and with the expenditure of a minlmum amount of labor.

In Figure 5 of the drawings 1 have shown the attachment in use for drilling a hole in the axial center of a section of. polygonal work and in this instance the spiral sprlng 30 can be entirely removed or the screw 37' moved out of engagement therewith and in this instance the sleeve 12 will operate on the shank freely without being advanced by the spiral spring. Any desired type of bit 55 is placed in the chuck 11 and it is obvious that after the attachment has been applied to the work that the bit will readily form axial openings therein. 3

' While I have shown the attachment being used only for the purpose of drilling holes in a piece of work and for forming threads on work, it is to be understood that the attachment can be used for a number of difierent purposes, such as finding the centers on round or polygonal work, in which instance the bit 55can be substituted for the centering tool. v .From the foregoing description, it can be seen that I have provideda novel attachment of an. exceptionally simple and durable character for braces which will permit the brace to be effectively used for boring and screw threading purposes.

Changes in details may be made without departing from thespirit or scope of this invention, but what I claim as new is:

1. An attachment for drill braces comprising an elongated shank for engagement with the chuck of the brace, a tool holding chuck carried by the forward end of the shank, a sleeve slidably mounted on the shank, a plurality of arcuate arms pivotally connected at their inner ends to the sleeve, a plurality of work engaging jaws connected to the forward ends of said arms, the forward ends of said arms normallyextending beyond the shank, angularly extending ears formed on the inner ends of the arms beyond the pivot points thereof, and a cone nut threaded on said sleeve for engaging the inner faces of said arms for the purpose specified;

2. An attachment for drill braces comprising an elongated shank, a tool receiving chuck carried by the forward end of said chuck, a sleeve slidably mounted upon the shank, a plurality of arcuate arms arranged radially of the shank, rockably connected at their inner ends to the sleeve, work engaging jaws pivotally connected'to the forward ends of said arms, angularly extending ears formed on the rear ends of the arms beyond the pivot points thereof, a cone nut threaded upon the sleeve engaging said ears, and expansion springs disposed between the arms and sleeve, for normally urging the arms away from the shank.

3. In an attachment for brace drills, an elongated shank, a tool receiving chuck carried by the forward end of the shank, a spiral strip arranged longitudinally of the shank and disposed around the same, means for anchoring. one end of the strip to the shank, a

sliding graduated arm arranged longitudinally of the shank havingthe opposite end of the strip securedthereto,means for advancing the graduatedarm to adjust the convolutions of the strip relative to one another, a sleeve mounted upon the shank and sleeve,

vthe shank and strip having sliding movethe strip, for advancing said shank in the K sleeve, said means being adjustable into and out of engagement with the spiral strip.

In testimony whereof I ailix my signature.

ROBERT J. F. HICKS. 

